I have two RX200'S and two Sigelei 75w mods. I also have the Sigelei 150TC that I actually don't use much anymore. I like the Sigelei 75's and use them almost daily, but I agree that they are boxy. Another one I have that I have really enjoyed is the Koopor Mini. It only goes to 60w but it's a bit smaller than the Sigelei's and it's edges are rounded, making it more hand friendly. Plus it's a little cheaper